Fig. 1. Daily precipitation (mm) and daily average air temperature (℃) throughout the experimental period.
Fig. 2. Soil water content and temperature (at 10 cm soil depth) throughout the experimental period.
Fig. 3. Changes of nitrous oxide (N2O) and carbon dioxide (CO2) emission rates from cropland during fallow season. The daily average soil-to-atmosphere N2O and CO2 fluxes in control (Con.), hairy vetch (H.V.) and rye from November 2017 – April 2018. Vertical bars are standard errors of the means (n=6).
Fig. 4. Cumulative nitrous oxide (N2O) and carbon dioxide (CO2) emissions during fallow season. The treatments were control (Con.), hairy vetch (H.V.) and rye from November 2017 – April 2018. Vertical bars are standard errors of the means (n=6). Bars designated with the same letters indicate not significantly different at ɑ=0.05.
Fig. 5. Changes of nitrous oxide (N2O) and carbon dioxide (CO2) emission rates in relation to soil temperature at 10 cm depth during fallow season. The treatments were control (Con.), hairy vetch (H.V.) and rye from November 2017 – April 2018.
Fig. 6. Changes of nitrous oxide (N2O) and carbon dioxide (CO2) emission rates in relation to soil water contents (V V-1, %) at 10 cm depth during fallow season. The treatments were control (Con.), hairy vetch (H.V.) and rye from November 2017 – April 2018.
Fig. 7. Changes of nitrous oxide (N2O) and carbon dioxide (CO2) emission rates from cropland during growing season. Vertical bars are standard errors of the means (n=6). Vertical arrow indicates dates of supplemental fertilizer application.
Table 1. Chemical properties of the studied soil before treatment
Table 2. Analytical conditions of gas chromatographic measurement for CO2 and N2O
Table 3. Nitrous oxide (N2O) and carbon dioxide (CO2) emissions by season
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